...what I think is probably the worst kind of stat, and the kind that turns people off of paying attention to new ones altogether: the stat that is advertised as measuring Thing A, but is massively affected by Things B, C, D, and E.

The common stat that’s the best example of this is ranking goalies by their raw Win totals. For a goalie to get a Win, his team needs to create shots and scoring chances, which he can’t control. He also can’t control the performance of the guy in the opposite net.